A statistical analysis of the tensile failure and hybrid effect of an intraply hybrid composite

The random critical-core probability model is adapted to model a unidirectionally arrayed hybrid sheet with alternating low elongation fibers and high elongation fibers. Utilizing this model in conjunction with the results of the stress analysis by Fukuda and Chou, both the first failure and ultimate failure of the hybrid are analysed. The concept of the hybrid effect for strains has been clarified and quantitative evaluation of the part of the hybrid effect which is not of thermal origin has been done. Numerical results are compared with available experimental data. A reasonable agreement is found between the analytical predictions and the experimental results.